Fluid reaction surfaces (i.e. – impellers) – Having positive means for impeller adjustment – Motor bodily rotatable with impeller hub or shaft
Reexamination Certificate
2005-09-13
2005-09-13
Look, Edward K. (Department: 3745)
Fluid reaction surfaces (i.e., impellers)
Having positive means for impeller adjustment
Motor bodily rotatable with impeller hub or shaft
C416S139000
Reexamination Certificate
active
06942458
ABSTRACT:
An improved variable pitch fan comprising a fan hub, with fan blades extending radially outward from the fan hub and mounted for rotation about respective radially extending axes corresponding to each fan blade. Each fan blade has a blade surface extending perpendicularly to the radially extending axis of the fan blade, each blade surface lying between respective outer edges of the corresponding fan blade and facing rearward. A pitch shifting mechanism is mounted in the hub and interconnects with the fan blades to control the rotational position of each fan blade about the corresponding radially extending axis of the fan blade. The respective outer edges of each fan blade diverge as the fan blade extends further radially outward; and the blade surface of each fan blade has an angle of attack that decreases as the fan blade extends radially outward. Each blade surface has a constant or increasing radius of curvature as the respective fan blade extends further radially outward. The respective outer edges of each fan blade are straight. Each fan blade has integral moulded counterweight supports and counterweights mounted on the counterweight supports.
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Gerwing Murray C.
McCallum Jonathan E.
Nelson Terry D.
Flexxaire Manufacturing Inc.
McAleenan James M.
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